LINQ 嵌套查询

直接代码：

//获取教材下的章跟篇

            IList<Chapter> chapters =

                EntAppFrameWorkContext.DomainModelService.ExtenedService<IEbookManage>()

                    .SearchChapterAndPartByEbookId(ebook.Key);

            Dictionary<Chapter,IList<KeyToChaSec>> dictionary=new Dictionary<Chapter, IList<KeyToChaSec>>();

            //根据章跟篇获取可用的知识点目录关系

            foreach (var chapter in chapters)

            {

                IList<KeyToChaSec> keyToChaSecs =

                    EntAppFrameWorkContext.DomainModelService.ExtenedService<IEbookManage>()

                        .SearchAllValidKeyToChaSecByChapterOrPart(chapter.Key);

                dictionary.Add(chapter,keyToChaSecs);

            }

            var jsons = from dic in dictionary

                        select new

                        {

                            ChapterID=dic.Key.Key,

                            ChapterName=dic.Key.Name,

                            KnowledgePoints=(

                            from keyToChaSec in dic.Value

                            select new

                            {

                                ID = keyToChaSec.KeyPoint.Key,

                                KnowledgePointRef =

                                    @"xhtml/" + keyToChaSec.ChpSect.PositionPage.Key + ".xhtml#kp" + keyToChaSec.KeyPoint.Key,

                                ChapterName = keyToChaSec.ChpSect.Name,

                                ChapterID = keyToChaSec.ChpSect.Key,

                                KnowledgePoint = keyToChaSec.KeyPoint.Name

                            })

                        };